JP2023045517A - Bolt set composed of male bolt and female bolt - Google Patents

Abstract

To surely connect two fixing members to each other while suppressing pressure by which a head part locally pressurizes surfaces of the fixing members in a connected state.SOLUTION: A bolt set is composed of a male bolt 10 and a female bolt 20 in which main male screw parts 11, 21 are integrally connected to head parts 12, 22. In the male bolt 10, a connecting screw part 13 screwed into the female bolt 20 is arranged at a tip of the main male screw part 11 coaxially with the main male screw part 11. In the female bolt 20, a connecting screw hole 23 into which the connecting screw part 13 is screwed is formed at a center of a tip face of the main male screw part 21 coaxially with the main male screw part 21. In the bolt set, the connecting screw part 13 is screwed into the connecting screw hole 23, and the male bolt 10 and the female bolt 20 are connected to each other.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolt set consisting of a male bolt and a female bolt that can connect a plurality of fixing members without using nuts.

A normal bolt is inserted through a through hole in two fixed members to be connected, and a nut is screwed into the tip of a threaded portion protruding from the fixed member to fix the two fixed members. A bolt that connects two fixing members in this structure has a bolt head arranged on one surface of the fixing member and a protruding threaded portion of the bolt on the other surface in the state where the two fixing members are connected. Since the nut is exposed, both sides of the fixing member cannot be designed in a similar manner, and the side where the threaded portion and the nut are exposed has a disadvantage that the appearance is worse than that of the head. As shown in FIG. 14, this problem can be solved by replacing the nut connected to the bolt 91 with a cylindrical nut 92 that connects a head 95 to a cylindrical portion 94 having a connection screw hole 93 on the inner surface thereof. However, in a structure in which a nut or a cylindrical nut 92 is screwed into a bolt 91 to connect two fixing members, the two fixing members are fixed by the two fixing members with their heads or nuts sandwiched between them. The surface is locally pressed with a strong pressure, and the nut or head profile limits the strength of the connection between the two fixing members.

JP 2016-180485 A

The present invention was developed with the aim of solving the above drawbacks, and an important object of the present invention is to suppress the pressure locally applied by the head to the surface of the fixing member in the connected state, and to To provide a bolt set capable of reliably connecting two fixing members.

Means for solving the problem and effects of the invention

The bolt set of the present invention consists of a male bolt and a female bolt in which the main male threaded portion is integrally connected to the head. The male bolt has a connecting threaded portion coaxial with the main male threaded portion at the tip of the main male threaded portion to be screwed into the female bolt. The female bolt is provided with a connecting screw hole coaxial with the main male threaded portion at the center of the front end surface of the main male threaded portion, into which the connecting threaded portion is screwed. In the bolt set described above, the male bolt and the female bolt are connected by screwing the connection screw portion into the connection screw hole.

In the bolt set described above, both the male bolt and the female bolt have the main male threaded portion connected to the head portion in an integrated structure, and the male bolt has the connection threaded portion at the tip of the main male threaded portion, Since the female bolt has a connection screw hole for screwing the connection screw part into the main male screw part, the male bolt and the female bolt can be connected by screwing the connection screw part into the connection screw hole, and the main male screw part can be used as a fixing member. Since the main male threads can be connected to the fixing member by screwing, the main male threads of the male and female bolts can be screwed into the fixing member to connect one or both of the male and female bolts and to the fixing member. A male bolt and a female bolt can be connected by a connection screw part and a connection screw hole. Either one or both of the male bolt and the female bolt that are connected to each other can be screwed into the fixing member to be connected. The fixing member to which the main male screw part is screwed and connected is connected to the fixing member not only by the pressure of the head but also by the main male screw part screwed into the fixing member. Therefore, the fixing member into which the main male screw is screwed can securely connect the two fixing members while reducing the pressure that the head locally presses the surface of the fixing member compared to the conventional one.

In a bolt set according to another embodiment of the present invention, the male bolt has a thread diameter of the connecting thread portion smaller than that of the main male thread portion, and the connecting thread portion is formed on the tip surface of the main male thread portion. It protrudes from the In this bolt set, the main male threaded portion of the male bolt is thickened, and the connection strength between the male bolt and the screw hole of the fixing member can be strengthened.

In a bolt set according to another embodiment of the present invention, the thread diameter and pitch of the main male screw portions of the male bolt and the female bolt are the same. With this bolt set, the male bolt and the female bolt can be screwed into the same threaded hole of the connecting fixing member.

In a bolt set according to another embodiment of the present invention, the pitch of the connecting screw portion and the connecting screw hole can be the same as the pitch of the main male screw portion. In this bolt set, the male bolt and the female bolt can be connected by screwing the connecting threaded portion into the connecting threaded hole while screwing the main male threaded portion into the threaded hole of the fixing member.

In a bolt set according to another embodiment of the present invention, the pitch of the connecting screw portion and the connecting screw hole can be different from the pitch of the main male screw portion. In this bolt set, the main male threads of both the male bolt and the female bolt are screwed into the threaded holes of the fixing members so that the spacing between the two fixing members can be adjusted and connected. In particular, as shown in FIG. 7, this bolt set can be connected at a predetermined distance without inserting a spacer between the two fixing members.

In a bolt set according to another embodiment of the present invention, the tip surfaces of the main male screw portions of the male bolt and the female bolt can be tapered so that they are connected to each other by a fitting structure. In this bolt set, the male bolt and the female bolt can be connected by arranging the front end surface of the main male screw portion in a fixed position with a fitting structure. In particular, by connecting the tip surfaces of the main male threads of the male and female bolts with a fitting structure, it is possible to effectively prevent water, etc., from entering these joints, realizing an excellent anti-corrosion effect. can.

In a bolt set according to another embodiment of the present invention, the tip of the main male threaded portion of the male bolt is tapered, and the tip of the main male threaded portion of the female bolt is fitted into the tip of the main male threaded portion of the male bolt. It can be tapered to fit. In this bolt set, the connecting threaded portion provided at the tip of the main male threaded portion of the male bolt is guided to the connecting threaded hole provided in the center of the main male threaded portion of the female bolt, and the male and female bolts are connected. can be connected smoothly.

In a bolt set according to another embodiment of the present invention, the male bolt and the female bolt each have a ring ridge on the tip surface of one of the main male screw portions, and a ring ridge on the tip surface of the other main male screw portion. It has a ring groove that guides the In this bolt set, the male bolt and the female bolt are connected by guiding a ring ridge provided on the tip surface of one main male threaded portion to a ring groove provided on the tip surface of the other main male threaded portion. can be securely connected.

In a bolt set according to another embodiment of the present invention, the entire length of the connecting threaded portion and the connecting threaded hole is covered with the leading end surfaces of the main male threaded portions of the male bolt and the female bolt in contact with each other. contact the bottom surface of the connecting screw hole.

In a bolt set according to another embodiment of the present invention, the male bolt has the same thread diameter and pitch of the main male threaded portion and the connecting threaded portion, and is continuous with the outer peripheral surfaces of the main male threaded portion and the connecting threaded portion. I have a screw. The male bolt can reduce the manufacturing cost by adopting a simple structure in which the main male threaded portion and the connecting threaded portion are formed into one male threaded portion having the same outer diameter.

In a bolt set according to another embodiment of the present invention, the tip surface of the connecting threaded portion can be tapered, and the bottom of the connecting threaded hole can be tapered to guide the tip of the connecting threaded portion.

A bolt set according to another embodiment of the present invention may have a columnar head with a polygonal outer shape, or a shape with a non-circular hole on the tip surface.

1 is a partially enlarged exploded cross-sectional view of a bolt set according to an embodiment of the present invention; FIG. FIG. 5 is a partially enlarged cross-sectional view of a bolt set according to another embodiment of the present invention; FIG. 6 is a partially enlarged exploded cross-sectional view of a bolt set according to another embodiment of the present invention; 2 is a cross-sectional view showing an example of connecting two fixing members with the bolt set shown in FIG. 1; FIG. FIG. 4 is a cross-sectional view showing a process of connecting two fixing members with the bolt set shown in FIG. 1; FIG. 4 is a cross-sectional view showing another example of connecting two fixing members with the bolt set shown in FIG. 1; FIG. 5 is a cross-sectional view showing an example of connecting two fixing members with a bolt set according to another embodiment of the present invention; FIG. 8 is a cross-sectional view showing a process of connecting two fixing members with the bolt set shown in FIG. 7; FIG. 4 is a cross-sectional view showing another example of connecting two fixing members with the bolt set shown in FIG. 1; FIG. 4 is a cross-sectional view showing another example of connecting two fixing members with the bolt set shown in FIG. 1; FIG. 5 is a cross-sectional view showing an example of connecting two fixing members with a bolt set according to another embodiment of the present invention; FIG. 5 is a cross-sectional view showing an example of connecting two fixing members with a bolt set according to another embodiment of the present invention; FIG. 5 is an exploded side view of a bolt set according to another embodiment of the invention; FIG. 10 is an exploded side view showing an example of a conventional bolt and cylindrical nut;

The present invention will now be described in detail with reference to the drawings. In the following description, terms indicating specific directions and positions (e.g., "upper", "lower", and other terms including those terms) are used as necessary, but the use of these terms is These terms are used to facilitate understanding of the invention with reference to the drawings, and the technical scope of the invention is not limited by the meaning of these terms. Also, parts with the same reference numerals appearing in a plurality of drawings indicate the same or equivalent parts or members.
Furthermore, the embodiments shown below show specific examples of the technical idea of the present invention, and the present invention is not limited to the following. In addition, unless there is a specific description, the dimensions, materials, shapes, relative arrangements, etc. of the components described below are not intended to limit the scope of the present invention, but are intended to be examples. It is intended. In addition, the contents described in one embodiment and example can also be applied to other embodiments and examples. Also, the sizes and positional relationships of members shown in the drawings may be exaggerated for clarity of explanation.

(Embodiment 1)
A bolt set 100 shown in the sectional view of FIG. 1 consists of a male bolt 10 and a female bolt 20 that are screwed together. The male bolt 10 and the female bolt 20 connect the main male threaded portions 11, 21 to the heads 12, 22 in an integral structure. The heads 12 and 22 have a prismatic shape with a polygonal shape such as a hexagon, or have a non-circular hole (not shown) on the tip surface so that they can be screwed in by rotation.

The male bolt 10 has a connecting threaded portion 13 coaxial with the main male threaded portion 11 at the tip of the main male threaded portion 11 to be screwed into the female bolt 20 . A male bolt 10 shown in FIG. ing. The female bolt 20 has a connecting screw hole 23 coaxial with the main male threaded portion 21 at the center of the tip surface of the main male threaded portion 21 , into which the connecting threaded portion 13 is screwed. In this bolt set 100, both the male bolt 10 and the female bolt 20, or one of the main male screw portions 11 and 21 are screwed into the screw holes 51 of the connecting fixing member 50, and the connection screw portion 13 is screwed into the connection screw hole 23. The two fixing members 50 are connected by screwing.

Furthermore, the male bolt 10 and the female bolt 20 shown in FIG. The screw diameter of the screw portion 21 is the same, and the pitch is also the same. However, although the male bolt 10 and the female bolt 20 will be described later in detail, the main male threaded portion 11 of the male bolt 10 and the main male threaded portion 21 of the female bolt 20 have different thread diameters, and are mutually threaded. Different pitches are also possible.

The male bolt 10 has a conical convex portion 14 formed by tapering the distal end surface of the connecting threaded portion 13 . The female bolt 20 is provided with a mortar-shaped conical concave portion 24 in which the bottom portion of the connecting screw hole 23 is tapered to guide and fit the conical convex portion 14 . Furthermore, the connecting screw portion 13 of the male bolt 10 shown in the enlarged cross-sectional view of FIG. are provided in the form of In addition, the connecting screw hole 23 of the female bolt 20 shown in the enlarged cross-sectional view of FIG. are provided. In the bolt set 100 described above, the conical projection 14 is fitted into the conical recess 24 and the stepped projection 15 is fitted into the stepped recess 25 in a state where the connection screw portion 13 is screwed into the connection screw hole 23 for connection. Therefore, it can be connected in a state where it is difficult to loosen.

The male bolt 10 and the female bolt 20 preferably have the connecting threaded portion 13 and the connecting threaded hole 23 of the same length. Here, making the connection screw hole 23 the same length as the connection screw portion 13 means making the depth of the connection screw hole 23 equal to the projection amount of the connection screw portion 13 . With this bolt set 100, the tip surfaces of the main male threaded portions 11 and 21 of the male bolt 10 and the female bolt 20 can be brought into close contact with each other in a state in which the fine screw is screwed to the bottom of the connecting screw hole 23. However, the male bolt 10 and the female bolt 20 can also be fixed by sandwiching a washer or a spring washer 60 between the tip surfaces of the main male screw portions 11 and 21, as shown in the partially enlarged sectional view of FIG. The male bolt 10 and the female bolt 20 used in this state are such that the leading end faces of the main male threaded portions 11 and 21 are in close contact with each other through washers and spring washers 60, and the leading end of the connecting screw portion 13 is connected to the connecting screw hole. The length should be close to the bottom of 23. However, in the bolt set of the present invention, the connecting threaded portion 13 is made longer or shorter than the connecting threaded hole 23 so that the connecting threaded portion 13 is partially screwed into the connecting threaded hole 23 or partially screwed into the connecting threaded hole 23. It is also possible to connect by screwing the connecting screw portion 13 into.

The main male screw portions 11 and 21 of the male bolt 10 and the female bolt 20 shown in FIG. In the bolt set 100 shown in this figure, the leading end surface of the main male screw portion 11 of the male bolt 10 is tapered to form an inclined joint portion 16 . The leading end surface of the main male screw portion 21 of the female bolt 20 is tapered to guide the inclined joint portion 16 and is provided with a mortar-shaped inclined concave portion 26 . In the bolt set 100 described above, the connecting threaded portion 13 is screwed into the connecting threaded hole 23 for connection, and the inclined joint portion 16 of the male bolt 10 is fitted into the inclined recessed portion 26 of the female bolt 20 . 13 can be guided to the center of the connecting screw hole 23, and axial positional deviation of the male bolt 10 and the female bolt 20 can be prevented for reliable connection. In particular, the outer peripheral surface of the inclined joint portion 16 can be brought into close contact with the inner peripheral surface of the inclined recessed portion 26 over a wide area, and can be connected in a state where it is difficult to loosen.

Further, in the bolt set 200 shown in FIG. 2, the tip surfaces of the main male screw portions 11 and 21 of the male bolt 10 and the female bolt 20 are made flat so as to face each other. The bolt set 200 shown in the figure shows a state in which the male bolt 10 and the female bolt 20 are connected by sandwiching the spring washer 60 between the opposing tip end surfaces of the main male screw portions 11 and 21 of the female bolt 20 . In this bolt set 200, the spring washer 60 makes it difficult for the male bolt 10 and the female bolt 20 to loosen. However, the male bolt 10 and the female bolt 20, in which the opposing tip surfaces of the main male screw portions 11 and 21 are planar, do not necessarily require a washer or spring washer 60 to be disposed between them, and the opposing tip surfaces are They can also be connected in close contact.

As shown in the enlarged cross-sectional view of FIG. 3, the main male threaded portions 11 and 21 of the male bolt 10 and the female bolt 20 are provided with a ring ridge 27 on the tip surface of one of the main male threaded portions 21 and the other. A ring groove 17 for guiding the ring ridge 27 can be provided on the tip end face of the main male screw portion 11 . The ring ridge 27 and the ring groove 17 are ring-shaped concentric with the centers of the main male screw portions 11, 21, so that the ring ridge 27 can be guided in the ring groove 17 in a fitting structure, and the connecting screw portion 13 can be connected to the connecting screw. When screwed into the hole 23, the ring ridge 27 is molded into a shape that can be brought into close contact while being slid along the ring groove 17. As shown in FIG. The bolt set 300 of FIG. 3 has a ring ridge 27 provided on the tip end face of the main male threaded portion 21 of the female bolt 20 and a ring groove 17 provided on the tip end face of the main male threaded portion 11 of the male bolt 10 .

In the bolt set 300 of FIG. 3, the connecting threaded portion 13 is screwed into the connecting threaded hole 23 for connection, and the ring ridge 27 of the female bolt 20 is fitted into the ring groove 17 of the male bolt 10 to connect the connecting threaded portion. 13 can be guided to the center of the connecting screw hole 23, and axial positional deviation of the male bolt 10 and the female bolt 20 can be prevented for reliable connection. In the bolt set 300 described above, the ring ridge 27 is provided on the main male threaded portion 21 of the female bolt 20, and the ring groove 17 is provided on the main male threaded portion 11 of the male bolt 10, but the bolt set is not shown. The ring ridge can be provided on the main male thread of the male bolt and the ring groove can be provided on the main male thread of the female bolt.

The cross-sectional view of FIG. 4 shows a specific example in which the male bolt 10 and the female bolt 20 are screwed into two fixing members 50 and the fixing members 50 are connected by the bolt set 100. As shown in FIG. In this fixing structure, the bolt set 100 connects two fixing members 50A and 50B with a predetermined gap. The main male threaded portions 11 and 21 of the male bolt 10 and the female bolt 20 are longer than the thickness of the fixing member 50 to be screwed in, and are screwed in with the tip protruding into the gap through the screw hole 51 of each fixing member 50. and connect the fixing members 50A and 50B. The male bolt 10 and the female bolt 20 have the same pitch of the connecting screw part 13 and the pitch of the main male screw parts 11, 21, or the pitch of the connecting screw part 13 is made smaller than the pitch of the main male screw parts 11, 21. . The distance between the fixing members 50A and 50B, which is determined when the connecting screw portion 13 is screwed into the connecting screw hole 23, can be adjusted by the pitch of the connecting screw portion 13 and the main male screw portions 11 and 21. It can be adjusted by screwing the portion 13 into the connecting screw hole 23 . 4 shows a state in which a spring washer 60 is sandwiched between the heads 12 and 22 of the male bolt 10 and the female bolt 20 screwed into the fixing member 50 and the surface of the fixing member 50. FIG. However, washers can be arranged instead of spring washers, or these can be omitted.

(1) and (2) of FIG. 5 show the process of connecting the two fixing members 50A and 50B with the bolt set 100 as shown in FIG. This figure shows a cross section where two fixing members 50A and 50B are connected by a male bolt 10 and a female bolt 20 in which the connecting threaded portion 13 and the main male threaded portions 11 and 21 have the same pitch. In this fixing structure, as shown in the cross-sectional view of FIG. 4, both the male bolt 10 and the female bolt 20 are screwed into the screw holes 51 of the respective fixing members 50, and the connecting screw portion 13 is screwed into the connecting screw hole 23. , the two fixing members 50A and 50B are connected at a constant interval. As shown in FIG. 5(1), this bolt set 100 is fixed to the fixing member 50 by screwing the main male threaded portion 21 of the female bolt 20 located at the upper side in the figure into the screw hole 51 of the fixing member 50A. By arranging the upper and lower fixing members 50A and 50B at regular intervals, or by arranging an elastic member 55 that can be elastically deformed between the fixing members 50A and 50B, the male bolt 10 is arranged as shown in FIG. 5(2). While screwing the main male screw portion 11 into the screw hole 51 of the fixing member 50B, the connecting screw portion 13 is screwed into the connecting screw hole 23 to connect the fixing members 50A and 50B.

The male bolt 10, in which the pitch of the connecting screw portion 13 is the same as the pitch of the main male screw portion 11, has a length (L1) that the main male screw portion 11 is screwed into the fixing member 50B and moves relative to the fixing member 50B. , the connecting screw portion 13 is screwed into the connecting screw hole 23, and the length (L2) of movement of the male bolt 10 with respect to the female bolt 20 is the same. The timing to start screwing the connecting screw portion 13 into the connecting screw hole 23 is determined by setting the distance between the head 12 of the male bolt 10 and the fixing member 50B to the screwing dimension (L2) at which the connecting screw portion 13 is screwed into the connecting screw hole 23. so that At this timing, the distance between the head 12 of the male bolt 10 and the surface of the fixing member 50B and the distance between the fixing members 50A and 50B are adjusted so that the connecting screw portion 13 starts screwing into the connecting screw hole 23 . When the main male screw portion 11 of the male bolt 10 is screwed into the fixing member 50B in this state, the main male screw portion 11 is screwed into the screw hole 51 of the fixing member 50B, and the head portion 12 is brought into close contact with the surface of the fixing member 50B. , the connection screw portion 13 is screwed into the connection screw hole 23, the tip of the connection screw portion 13 is in close contact with the bottom surface of the connection screw hole 23, and the fixing members 50A and 50B are connected by the male bolt 10 and the female bolt 20. . In this connection structure, the heads 12, 22 of the male bolt 10 and the female bolt 20 are in close contact with the surfaces of the fixing members 50A, 50B, the tip of the connection screw portion 13 is in close contact with the bottom of the connection screw hole 23, and the male bolt The two fixing members 50A and 50B are connected by the bolt set 100, with the leading end surfaces of the main male screw portions 11 and 21 of the female bolt 20 also closely contacting each other.

FIGS. 5A and 5B show a state in which the female bolt 20 is first screwed into the fixing member 50A, then the male bolt 10 is screwed into the fixing member 50B, and the fixing members 50A and 50B are connected by the bolt set 100. 4, the main male screw portion 11 of the male bolt 10 is first screwed into the fixing member 50B and fixed, and then the main male screw portion 21 of the female bolt 20 is screwed into the fixing member 50A, and The two fixing members 50A and 50B can also be connected by screwing the connecting screw portion 13 into the connecting screw hole 23 .

As described above, the connecting structure in which the main male threaded portions 11 and 21 of both the male bolt 10 and the female bolt 20 are screwed into the screw hole 51 of the fixing member 50 to fix both the male bolt 10 and the female bolt 20 firmly. It has the advantage that the two fixing members 50 can be connected by the connecting screw portion 13 and the connecting screw hole 23 while connecting to the fixing member 50 . In addition, it is possible to realize the feature that the two fixing members 50 can be connected at a predetermined interval. In addition, this connection structure can also be fixed by sandwiching an elastic member 55 such as a rubber-like elastic body between the two fixing members 50 .

FIG. 6 is a cross-sectional view illustrating a structure in which only the female bolt 20 is screwed into the screw hole 51 of the fixing member 50A to connect the fixing member 50B. It is inserted through the through hole 52 of the fixing member 50 without being screwed into the member 50B. In this connection structure, the main male screw portion 21 of the female bolt 20 is screwed into the screw hole 51 of the fixing member 50A, and the main male screw portion 21 of the male bolt 10 is screwed in a state in which the tip of the main male screw portion 21 protrudes from the screw hole 51. The screw portion 11 is inserted through the through hole 52 of the fixing member 50B, and the connection screw portion 13 is screwed into the connection screw hole 23 to tightly connect the two fixing members 50A and 50B. In this figure, the female bolt 20 is screwed into the fixing member 50A and fixed, and then the connection screw portion 13 of the male bolt 10 is screwed into the connection screw hole 23 to be connected. The female bolt 20 is inserted through the through hole 52 of the fixing member 50B in a state where it is screwed into the screw hole 51 of the fixing member 50A and the tip protrudes from the screw hole 51, and the connection screw portion 13 is screwed into the connection screw hole 23 for connection. You can also In this connection structure, the two fixing members 50A and 50B are closely connected, and the main male threaded portions 11 and 21 of one of the female bolt 20 and the male bolt 10 are screwed into the screw holes 51 of the fixing member 50A to ensure It has the feature that it can be fixed to

FIG. 7 shows that while the main male screw portions 11 and 21 of both the male bolt 10 and the female bolt 20 are screwed into the fixing member 50 and fixed, the connecting screw portion 13 is screwed into the connecting screw hole 23 to form two fixing members 50A. , 50B. In this bolt set 400, the pitch of the connecting screw portion 13 is smaller than the pitch of the main male screw portions 11 and 21. As shown in FIG. In this connection structure, as shown in FIG. 7, the main male screw portion 21 of the female bolt 20 is screwed into the screw hole 51 of the fixing member 50A and fixed, and the main male screw portion 11 of the male bolt 10 is screwed into the fixing member 50B. The two fixing members 50A and 50B are connected by screwing the connecting screw portion 13 into the connecting screw hole 23 while screwing the connecting screw portion 13 into the screw hole 51 of . The male bolt 10, in which the pitches of the connecting threaded portion 13 and the main male threaded portion 11 are different, has a dimension such that the main male threaded portion 11 is screwed into the fixing member 50B in one rotation, and the connection threaded portion 13 is screwed into the connecting screw hole 23. Dimensions are not identical. In the bolt set 400 of FIG. 8, the pitch of the connecting threaded portion 13 is half the pitch of the main male threaded portion 11 . In this bolt set 400, the dimension (L3) for screwing the male bolt 10 into the screw hole 51 of the fixing member 50B and moving is twice the dimension (L4) for screwing the connecting screw portion 13 into the connecting screw hole 23. Therefore, in a state in which the tip of the connecting screw portion 13 is guided to the opening of the connecting screw hole 23, the distance between the main male screw portions 11 and 21 of the male bolt 10 and the female bolt 20 is adjusted to the head 12 of the male bolt 10 and this The male bolt 10 is screwed into and connected to the fixing member 50B at a distance of 1/2 or less from the surface of the fixing member 50B into which it is screwed. In this connection structure, preferably, the tip of the connection screw portion 13 is in close contact with the bottom of the connection screw hole 23, the tips of the main male screw portions 11 and 21 of the male bolt 10 and the female bolt 20 are also in close contact, and furthermore, the male bolt 10 The two fixing members 50A and 50B are connected in a state where the heads 12 and 22 of the female bolt 20 are also in close contact with the surface of the fixing member 50. As shown in FIG.

Further, as shown in the cross-sectional view of FIG. 9, the bolt set 100 is such that the heads 12, 22 of the male bolt 10 and the female bolt 20 are closely attached to the surface of the fixing member 50, and the main parts of the male bolt 10 and the female bolt 20 are attached. The two fixing members 50A and 50B can be connected in a state in which the tip surfaces of the male screw portions 11 and 21 are in close contact and the tip of the connection screw portion 13 is not in close contact with the bottom of the connection screw hole 23. Further, although not shown, the bolt set includes the male bolt and the female bolt with the heads of the male bolt and the female bolt in close contact with the surface of the fixing member, and the tip of the connecting threaded portion and the bottom of the connecting threaded hole in close contact with each other. It is also possible to connect the tip surfaces of the main male threaded portions of the two in a state in which they are not in close contact with each other.

Furthermore, in the bolt set of the present invention, as shown in the cross-sectional view of FIG. Alternatively, the connecting screw portion 13 can be screwed into the connecting screw hole 23 to connect the two fixing members 50A and 50B in close contact with each other. In this connection structure, preferably, the head portions 12 and 22 are in close contact with the surface of the fixing member 50, and the tip of the connection screw portion 13 is closely connected to the bottom surface of the connection screw hole 23 as shown in the figure. , the tip surfaces of the main male screw portions 11 and 21 of the male bolt 10 and the female bolt 20 are not brought into close contact with each other, and the tip of the connection screw portion 13 is not brought into close contact with the bottom surface of the connection screw hole 23. 50 can also be closely connected.

Further, the bolt set 500 shown in the sectional view of FIG. 11 shows an example in which the main male screw portion 11 of the male bolt 10 and the main male screw portion 21 of the female bolt 20 have different screw diameters. In the illustrated bolt set 500 , the thread diameter of the main male threaded portion 11 of the male bolt 10 is made smaller than the thread diameter of the main male threaded portion 21 of the female bolt 20 . In the bolt set 500 shown in FIG. 11, the thread diameter of the main male threaded portion 11 of the male bolt 10 is made smaller than the thread diameter of the main male threaded portion 21 of the female bolt 20. The thread diameter of the threaded portion can be made larger than the thread diameter of the main male threaded portion of the female bolt. In the male bolt 10 and the female bolt 20 shown in the figures, the main male screw portion 11 of the male bolt 10 and the main male screw portion 21 of the female bolt 20 have the same pitch. The pitch can also be different pitches.

The cross-sectional view of FIG. 11 shows an example in which the male bolt 10 and the female bolt 20 are screwed into two fixing members 50 and the fixing members 50 are connected by a bolt set 500 . In the bolt set 500 shown in the figures, the outer diameters of the main male threaded portions 11 and 21 of the male bolt 10 and the female bolt 20 are different, so the inner diameters of the screw holes 51 of the fixing member 50 into which these are screwed are also different. Thus, the inner diameter of the screw hole 51 into which the male bolt 10 or the female bolt 20 is screwed is specified by the outer diameter of the main male screw portions 11 and 21 into which it is screwed. In other words, the outer diameters of the male bolt 10 and the female bolt 20 can be specified in consideration of the connection strength between the main male screw portions 11 and 21 and the fixing member 50 . Therefore, the male bolt 10 and the female bolt 20 can change the outer diameters of the main male screw portions 11 and 21 according to the thickness, material, etc. of the fixing member 50 to be connected.

Further, in the bolt set 600 shown in FIG. 12, the thread diameter and pitch of the main male threaded portion 11 and the connecting threaded portion 13 of the male bolt 10 are made equal, and the outer peripheral surfaces of the main male threaded portion 11 and the connecting threaded portion 13 are continuous. A male screw is provided to Specifically, in the male bolt 10 of FIG. 12, the outer diameters of the main male threaded portion 11 and the connecting threaded portion 13 are made equal, and the main male threaded portion 11 and the connecting threaded portion 13 are composed of one male threaded portion. are doing. This bolt set 600 is also connected to each other by screwing the connection screw portion 13 provided at the tip of the main male screw portion 11 of the male bolt 10 into the connection screw hole 23 of the female bolt 20 .

The cross-sectional view of FIG. 12 shows an example in which the male bolt 10 and the female bolt 20 are screwed into two fixing members 50 and the fixing members 50 are connected with the bolt set 600 . In the bolt set 600 shown in the figure, the main male threaded portion 11 and the connecting threaded portion 13 of the male bolt 10 are composed of a single male threaded portion having the same thread diameter. It does not have a tip surface that contacts the tip surface of the portion 21 . For this reason, as shown in FIG. 12, this bolt set 600 fixes the leading end surface of the main male threaded portion 21 of the female bolt 20 as a positioning surface for positioning the fixing member 50B facing thereto. Member 50B can be placed in place. For example, the female bolt 20 is arranged such that the amount of protrusion of the main male screw portion 21 protruding to the inner surface of the fixing member 50A into which the main male screw portion 21 is screwed is equal to the distance (D) between the opposing fixing members 50A and 50B. By designing the entire length of the main male screw portion 21, the fixing members 50A and 50B can be connected while maintaining a predetermined gap (D). Furthermore, the connection screw portion 13 of the male bolt 10 screwed into the screw hole 51 of the fixing member 50B arranged at a fixed position with respect to the tip surface of the female bolt 20 is connected to the connection screw hole 23 provided in the tip surface of the female bolt 20. By screwing, the fixing member 50 is securely connected while firmly connecting the male bolt 10 to the female bolt 20 . However, the fixing member 50B does not necessarily need to be brought into contact with the tip end surface of the main male screw portion 21 of the female bolt 20, and the fixing member 50B can be connected at a position away from the tip end surface of the female bolt 20.

The fixing member 50B shown in FIG. 12 has a threaded hole 51 into which the male bolt 10 is screwed. In this case, by screwing the male bolt 10 inserted through the through hole of the fixing member 50B into the female bolt 20, the fixing member 50B is securely connected. In particular, in a state in which the fixing member 50B is sandwiched between the tip surface of the main male screw portion 21 of the female bolt 20 and the head portion 12 of the male bolt 10, the fixing member 50B can be securely connected while being arranged at a fixed position. Also, the male bolt 10 and the female bolt 20 shown in the figure show a state in which the fixing member 50B is connected at a fixed position with the connection screw portion 13 screwed to the bottom of the connection screw hole 23. It is not necessary to have a structure in which the connection screw portion 13 is screwed to the bottom of the connection screw hole 23 in a state where the are connected to the fixed position. For example, the amount of screwing the connecting screw portion 13 into the connecting screw hole 23 can be changed according to the thickness of the fixing member 50B to be connected. For example, the female bolt 20, as shown by the dashed line in FIG. 12, is designed to have a deep connection screw hole 23 so that the connection screw portion 13 can be optimally screwed in while accommodating various thicknesses of the fixing member 50B. It can be connected by screwing it into the connecting screw hole 23 so as to have a sufficient amount.

Further, FIG. 13 shows an example of application of the bolt set described above, in which an intermediate connector 30 is connected between the male bolt 10 and the female bolt 20. As shown in FIG. The illustrated intermediate connector 30 includes a columnar main body 31 arranged coaxially with the male bolt 10 and the female bolt 20 . The columnar main body 31 has an intermediate screw hole 36 in the center of one end face into which the connecting screw part 13 of the male bolt 10 is screwed, and the other end face is screwed into the connecting screw hole 23 of the female bolt 20. An intermediate screw portion 33 is provided so as to protrude. The body portion 31 shown in the figure has an intermediate screw portion 33 and an intermediate screw hole 36 coaxially provided.

The intermediate threaded portion 33 of the main body portion 31 has a tapered tip end surface to form a conical convex portion 34, which fits into a mortar-shaped conical concave portion 24 provided at the bottom of the connecting screw hole 23 of the female bolt 20. It has a shape that Further, the intermediate threaded portion 33 of the main body portion 31 in the figure has a conical convex portion 34 provided at the tip thereof which is tapered in two steps, and a stepped convex portion 35 which protrudes along the outer peripheral surface is provided in a ring shape. The above-described intermediate connector 30 is connected by screwing the connection screw portion 13 of the male bolt 10 into the intermediate screw hole 36 of the main body portion 31, and the conical convex portion 14 is fitted into the conical concave portion 34, and the stepped convex portion 15 is fitted into the stepped recess 35 to connect in a state where it is difficult to loosen.

Further, the body portion 31 is provided with a mortar-shaped conical concave portion 37 in which the bottom portion of the intermediate screw hole 36 is tapered to guide and fit the conical convex portion 14 of the male bolt 10 connecting screw portion 13 . Further, the intermediate screw hole 36 of the main body 31 has a stepped recess 38 that guides the stepped projection 15 provided on the conical projection 14 of the connecting threaded portion 13 in a fitted state by making the conical recess 37 tapered in two stages. It is installed along the inner circumference. The above-described intermediate connector 30 is connected by screwing the connecting threaded portion 13 of the female bolt 20 into the intermediate screw hole 36 so that the conical protrusion 14 is fitted into the conical recess 37, and the stepped protrusion 15 is fitted into the stepped recess. 38, and connected in a state where it is difficult to loosen.

The main body portion 31 shown in the figure has flat both end surfaces, and the front end surface of the main male screw portion 11 of the male bolt 10 and the front end surface of the main male screw portion 21 of the female bolt 20 which face the male bolt 10 are: It has a shape that abuts in a surface contact state. Although not shown, both end surfaces of the main body may be configured to fit with the tip surfaces of the main male screw portions of the opposing male and female bolts, as described above. In other words, the opposing surfaces of the intermediate connector and the male bolt and the opposing surfaces of the intermediate connector and the female bolt may have a tapered inclined joint portion on one side and a mortar-shaped inclined recessed portion on the other side. It is also possible to provide a ridge and on the other side a ring groove for guiding the ring ridge.

Further, it is preferable that the intermediate connector 30 has an outer diameter of the body portion 31 smaller than an inner diameter of the screw hole 51 of the fixing member 50 into which the male bolt 10 or the female bolt 20 is screwed. As a result, the female bolt 20 can be screwed into the screw hole 51 of the fixing member 50 with the intermediate connector 30 fixed to the tip of the female bolt 20, or the intermediate connector 30 can be fixed to the tip of the male bolt. In this state, the male bolt 10 can be screwed into the screw hole 51 of the fixing member 50 . However, the intermediate connector 30 may have the outer diameter of the body portion 31 larger than the inner diameter of the screw hole 51 of the fixing member 50 . After screwing either the male bolt 10 or the female bolt 20 into the screw hole 51 of the fixing member 50, the intermediate connecting member 30 is connected to the tip thereof.

Furthermore, the intermediate connector 30 preferably has a non-circular, polygonal shape in cross section of the main body 31 . The body portion 31 of the intermediate connector 30 preferably has an outer shape of a regular polygonal prism. An intermediate connector 30 shown in FIG. 13 has a body portion 31 that has a regular hexagonal columnar shape composed of a plurality of plane portions 31A. When the intermediate connector 30 having this shape is connected to the male bolt 10 or the female bolt 20, a tool such as a wrench or a spanner having an inner shape that matches the facing flat portion 31A of the main body portion 31 is used. 31 is held in a non-rotating state and screwed in to ensure the connection. However, the main body portion 31 of the intermediate connector 30 does not necessarily have to have a regular polygonal columnar shape, and may have a columnar shape having partially opposed planar portions.

As described above, the configuration in which the intermediate connector 30 is connected between the male bolt 10 and the female bolt 20 has the advantage that the interval between the connecting fixing members 50 can be adjusted by the intermediate connector 30 . In other words, the fixing members 50 can be connected at an optimum interval by adjusting the length of the intermediate connector 30 so that the connecting members 50 have a desired interval. Therefore, it is possible to provide an intermediate connector of optimum length while using a single male bolt 10 and female bolt 20 without changing the length of the main male threaded portions 11, 21 of the male bolt 10 and female bolt 20. By selecting 30, the fixing members 50 can be connected at an optimum interval, so that the manufacturing cost of the male bolt 10 and the female bolt 20 can be reduced.

INDUSTRIAL APPLICABILITY The bolt set of the present invention can be optimally used for connecting multiple fixing members while securely connecting either one or both of the male and female bolts to the fixing member.

Reference Signs List 100, 200, 300, 400, 500, 600... Bolt set 10... Male bolt 11... Main male screw part 12... Head part 13... Connection screw part 14... Conical convex part 15... Step convex part 16... Inclined joint part 17... Ring groove 20 Female bolt 21 Main male threaded portion 22 Head 23 Connecting screw hole 24 Conical concave portion 25 Step concave portion 26 Inclined concave portion 27 Ring ridge 30 Intermediate connector 31 Body portion 31A Flat surface Part 33...Intermediate screw part 34...Conical convex part 35...Stepped convex part 36...Intermediate screw hole 37...Conical concave part 38...Stepped concave part 50, 50A, 50B...Fixing member 51...Screw hole 52...Through hole 55...Elastic body 60 Spring washer 91 Bolt 92 Tube nut 93 Connection screw hole 94 Tube part 95 Head

Claims (12)

Consists of a male bolt and a female bolt in which the main male screw part is connected to the head in an integrated structure,
the male bolt has a connecting threaded portion coaxially with the main male threaded portion to be screwed into the female bolt at the tip of the main male threaded portion;
The female bolt has a connecting threaded hole into which the connecting threaded part is screwed, coaxially with the main male threaded part, at the center of the tip surface of the main male threaded part,
A bolt set in which the male bolt and the female bolt are coupled by screwing the coupling threaded portion into the coupling screw hole. The bolt set according to claim 1,
A bolt set in which the male bolt has a thread diameter of the connection screw portion smaller than that of the main male screw portion, and the connection screw portion protrudes from a tip surface of the main male screw portion. . The bolt set according to claim 2,
A bolt set in which the main male screw portions of the male bolt and the female bolt have the same screw diameter and pitch. The bolt set according to any one of claims 1 to 3,
A bolt set in which the pitch of the connecting screw portion and the connecting screw hole is the same as the pitch of the main male screw portion. The bolt set according to any one of claims 1 to 3,
A bolt set, wherein a pitch of the connection screw portion and the connection screw hole is different from a pitch of the main male screw portion. A bolt set according to any one of claims 1 to 5,
A bolt set in which tip surfaces of the main male screw portions of the male bolt and the female bolt are tapered to be connected to each other in a fitted state. A bolt set according to claim 6,
the tip surface of the main male screw portion of the male bolt is tapered,
A bolt set in which a tip end surface of the main male threaded portion of the female bolt is tapered to fit the tip of the main male threaded portion of the male bolt. A bolt set according to any one of claims 1 to 6,
The male bolt and the female bolt are
Having a ring ridge on the tip surface of one of the main male screw portions,
A bolt set having a ring groove for guiding the ring ridge on the tip end face of the other main male screw portion. A bolt set according to any one of claims 1 to 8,
The connecting screw part and the connecting screw hole have the same length,
The thin screw is screwed into the connecting screw hole,
In a state where the tip surfaces of the main male screw portions of the male bolt and the female bolt are in contact with each other,
A bolt set in which the tip of the connecting screw portion contacts the bottom surface of the connecting screw hole. The bolt set according to claim 1,
The male bolt is a bolt set in which the main male screw portion and the connection screw portion have the same screw diameter and pitch, and a male screw is provided continuously on the outer peripheral surface of the main male screw portion and the connection screw portion. . A bolt set according to any one of claims 1 to 10,
The tip surface of the connecting threaded portion is tapered to a point,
A bolt set in which the bottom of the connection screw hole is tapered so that the tip of the connection screw portion can be guided. A bolt set according to any one of claims 1 to 11,
A bolt set in which the head has a columnar shape with a polygonal outer shape, or a non-circular hole in the tip surface.

Images